Drainage Design Manual - the City of San Luis Obispo

3. or, is an individual development project or new redevelopment project that would addmore than 930 m 2 (10,000 ft 2 ) of impervious surface area, or involves more than 1.0hectare (2.5 acres) of land;4. or, Requires a permit from any one of the following regulatory agencies:U.S. Army Corps of Engineers Section 10 or Section 404 permit;California Department of Fish and Game Section 1601 or 1603 Streambed AlterationAgreement;Central Coast Regional Water Quality Control Board Section 401 Water QualityCertification or Wavier;Stormwater permit issued by the Central Coast Regional Water Quality ControlBoard.2.3 Submittal RequirementsSubmittal of a detailed Hydrologic and Hydraulic Analysis Report is required for all proposeddrainage facilities pursuant to Section 2.2. This requirement is applicable to discretionaryapplications for proposed developments including Residential Subdivisions, Rural Subdivisions,Minor Land Divisions (parcel maps), Commercial, Industrial and Multi-Family Developments todescribe the drainage related facilities associated with any of the above activities. In cases wherethe applicant determines that drainage improvements are minor and would not require a detailedanalysis, the applicant can request, in writing, an exemption from this submittal requirement begranted by the City or County. Applications will be reviewed on a case-by-case basis whenmitigating circumstances can be demonstrated by the applicant.Provisions by the City or County Grading and Erosion Control Ordinances also require submittalof a grading and drainage plan when surface drainage is discharged onto any adjoining property.An analysis of the effect of the discharge is required to be included with the submittal.Drainage analysis submittals shall include adequate supporting hydrologic and hydraulicinformation for the proposed improvements and supporting documentation includingcomputations and any relevant information, which will assist in the review process.Drainage analysis submittals to be provided with the design plans included in discretionaryapplications for major land divisions shall include a hydrologic and hydraulic analysis report.The following outlines the requirements for submittal of a Hydrologic and Hydraulic Analysis(Drainage) Report.2.3.1 Hydrologic and Hydraulic Analysis ReportThe Hydrologic and Hydraulic Analysis Report should include a complete analysis ofproposed improvements and supporting documentation including computations and anyrelevant information, which will assist in the review process. The Report shall beSLO Creek Drainage Design Manual 5 February 2003